It's a "rabbit start" or something like that - the power boat runs down the line and the boards have to start behind the boat...could be interesting if someone gets caught in front of it trying to cut it close - huh.
It looks like it's a variation on the classic Gate start that can be used to start large fleets with an (almost) zero chance of the start gewtting binned.
I'll explain how it works if anyone is interested.
